AV cables iPad2 vs iPad3

I use an extension cable with my iPad2 to connect to an external amplifier with a built-in Dock. I have recently purchased an iPad3 (awaiting delivery) and was wondering if the cable will work with the updated iPad, or do I need to procure one specifically made for the iPad3.

The cable supports AV, so it's not just a matter of charging/syncing.

Thanks in advance!

Dave in Oz